can anyone help me with useing odnr web site.

i'm from dayton ohio. and i'm trying to get maps and detaled info. on all my local lakes and rivers .like depths and all that. an under water maps . figured it would really help in finding hole and bends. so i could actualy pin point a place i'm planing to try. well you all understand what i'm trying to explain .lol. thank you all for any info to help me out ..